THE CHARTERED INSTITUTION OF BUILDING SERVICES ENGINEERS

FACTFILE No 5 August 1997

Advice regarding High Frequency electronic luminairesThe use of high frequency electronic ballasts should enable more efficient and improved performancelighting equipment to be specified, installed and operated. However there appears to be some reluctanceto adopt the new technology because of misunderstandings or lack of information as to how the productshould operated.

The following three pages are separate although similar advice for different potential user groups to avoidthe pitfalls and to be reminded of the key aspects related to electronic ballasts. In this repetitive way theinformation is conveniently presented (in the Churchillian manner) on one side of an A4 sheet. In thisway it can be readily copied and distributed to all who need to know.

The original document was prepared jointly by LIF and supported by ECA, ECA of Scotland, andCIBSE. We are grateful to LIF for permitting its reproduction as this Factfile.

Hopefully Lighting Division members are aware of this information but there is a need to stimulatemarket acceptance and confidence in high frequency lighting. This Factfile is therefore intended to be ahandy aide-memoire which can be passed to those who are less conversant with the latest lightingproducts but have responsibility for specification, luminaire design or lighting installation.

Advice for the Specification of High Frequency LuminairesA High Frequency ballast uses the same sensitive electronic components as your Hi-Fi system or yourVideo player and must be treated with the same degree of care.

The following points must be observed to ensure safe and trouble free luminaire production and supply.

A: The insulation test should be carried out in accordance with the requirements of EN 60598-1.B: Consideration must be made when specifying through wiring of luminaires to ensure full EMC compliance and suitable

cable temperatures.C: Where conventional switch start, quick start or semi-resonant (SRS) luminaires are being replaced by High Frequency

luminaires specify that all luminaires on a circuit must be replaced before power is restored as the spikes produced by theold ballasts may damage the new electronic ballasts. After exchanging conventional control gear for high frequency theincreased simultaneous inrush currents must be considered when deciding switch rating and protection levels.

D: When installing dimming or control systems the mains wiring and ELV control wiring which must be mains (500 V)insulated, must be segregated in separate screened and earthed channels/conduits and must not be positioned parallel toeach other within the luminaire due to radiated electrical interference. The exception to this is to use a digital bus system,which is non corruptible, with 500 V insulation sleeving which can then be run adjacent to the mains voltage wiring.External wiring leading to the luminaire can be adjacent for up to 5 metres (i.e. switch lines) but otherwise must beseparated permanently by at least 50 mm.

E: When a luminaire is operated by a remote ballast or with a remote emergency lighting pack, the cable linking theluminaire to the ballast or emergency pack is deemed to be part of the luminaire. It is therefore necessary that theluminaire/connecting cable/ballast (emergency pack) is CE marked and compliant with the relevant standards. This wouldnormally be supplied as a kit by the luminaire manufacturer. If, however, it is necessary to provide this wiring on a site,advice on the length of the inter linking wiring should be obtained from the Consultant or Manufacturer. The luminaire,remote ballast (emergency unit) and the inter linking cable should be then CE marked as a complete item andresponsibility for this will fall to the installer.

F: Cold start electronic ballasts, i.e. where the pre-heat time is very short, must not be used in conjunction with automaticoccupancy sensors. Warm start ballasts may be used as long as the on period of the sensor is in excess of 20 minutesotherwise very short lamp life will occur.

G: It is not recommended to use Master/Slave configurations (where the ballast in one luminaire operates the lamp in anotherluminaire unless supplied and approved by the luminaire manufacturer.

H: Retrofitting HF ballasts on site is no longer allowed unless a sample luminaire has been both electrical safety and EMCtested, approved and CE marked accordingly.

I: The suppliers of your luminaire must supply or be asked for all relevant installation documentation for your ownprotection.

J: Do not use MCB tripping classification lower than type C, as simultaneous starting pulses may cause nuisance tripping ofthe MCB. The Electrical Consultant or ballast manufacturer may specify a higher tripping classification.

K: If RCD protection is required a 30 mA inert surge proof RCD should be used for each lighting circuit and not perdistribution board as accumulative earth leakage from the ballasts will cause a bulk RCD to trip.

L: Lighting circuits must not be used to supply temporary power toa) Lift equipmentb) Inductive motorsc) Welding geard) or any other form of electrical equipment

as the electrical starting impulses (spikes) will destroy electronic components.M: The contractor must ensure that the quality of the mains supply to the high frequency installation compiles with BS EN

50160.

This document is issued by LIF, and supported by the ECA, ECA of Scotland and CIBSE.

Advice for the Installation of High Frequency LuminairesA High Frequency ballast uses the same sensitive electronic components as your Hi-Fi system or yourVideo player and must be treated with the same degree of care.

The following points must be observed to ensure a safe and trouble free installation.

A: Testing is normally carried out with luminaires disconnected to ensure integrity of the wiring. However, do not carry outthe insulation test on your Lighting Circuits with the luminaires connected unless L & N are linked within each luminairefor the period of the test. Do not exceed a time duration of 2 seconds or exceed 500 volts. The measurement is then madebetween the linked L/N to earth.

B: Do not use through wiring in a continuous run of luminaires unless provision has been made for this by the manufacturer.This is necessary to ensure that the EMC characteristics of the luminaires are not altered.

C: Do not use MCB tripping classification lower than type C, as simultaneous starting pulses may cause nuisance tripping ofthe MCB. The Electrical Consultant or ballast manufacturer may specify a higher tripping classification.

D: If RCD protection is required a 30 mA inert surge proof RCD should be used for each lighting circuit and not perdistribution board. This is because accumulated earth leakage from the ballast will cause a common RCD to trip.

E: Lighting Circuits must not be used to supply temporary power toa) Lift equipmentb) Inductive motorsc) Welding geard) or any other form of electrical equipment

as their electrical starting impulses (spikes) will destroy electronic components.F: Where conventional switch start, quick start or semi-resonant (SRS) luminaires are being replaced by High Frequency

luminaires, all luminaires on a circuit must be replaced totally before power is restored as the spikes produced by the oldballasts may damage the new electronic ballasts. After exchanging conventional control gear for high frequency theincreased simultaneous inrush currents must be considered when deciding switch rating and protection levels.

G: When installing dimming or control systems the mains wiring and ELV control wiring which must be mains (500 V)insulated, must be segregated in separate screened and earthed channels/conduits and must not be positioned parallel toeach other within the luminaire due to radiated electrical interference. The exception to this is to use a digital bus system,which is non corruptible, with 500 V insulation sleeving which can then be run adjacent to the mains voltage wiring.External wiring leading to the luminaire can be adjacent for up to 5 metres (i.e. switch lines) but otherwise must beseparated permanently by at least 50 mm.

H: Energy Limiters should never be used with High Frequency luminaires due to their incompatibility.I: When a luminaire is operated by a remote ballast or with a remote emergency lighting pack, the cable linking the

luminaire to the ballast or emergency pack is deemed to be part of the luminaire. It is therefore necessary that theluminaire/connecting cable/ballast (emergency pack) is CE marked and compliant with the relevant standards. This wouldnormally be supplied as a kit by the luminaire manufacturer. If, however, it is necessary to provide this wiring on a site,advice on the length of the inter linking wiring should be obtained from the Consultant or Manufacturer. The luminaire,remote ballast (emergency unit) and the inter linking cable should be then CE marked as a complete item andresponsibility for this will fall to the installer.

J: Cold start electronic ballasts, i.e. where the pre-heat time is very short, must not be used in conjunction with automaticoccupancy sensors. Warm start ballasts may be used as long as the on period of the sensor is in excess of 20 minutesotherwise very short lamp life will occur.

K: It is not recommended to use Master/Slave configurations (where the ballast in one luminaire operates the lamp in anotherluminaire unless supplied and approved by the luminaire manufacturer.

L: When installing automatic mains switching ensure that the switch makes a complete break in the supply.M: The installer must ensure that the equipment is not connected to electrical supplies unless they comply with the

requirement of BS EN 50160.N: At the time of installation the installer should check that the maximum ambient temperature recommended by the

luminaire manufacturer for their luminaire is not likely to be exceeded in the particular installation.

This document is issued by LIF and supported by ECA, ECA of Scotland and CIBSE

Advice for the Construction of High Frequency LuminairesA High Frequency ballast uses the same sensitive electronic components as your Hi-Fi systemor your Video player and must be treated with the same degree of care.

The following points must be observed to ensure a safe and trouble free installation.

A: Do not exceed a time duration of 2 seconds when insulation testing your luminaires for compliance with BSEN 60598-1 as the high voltage of 500 volts with a long time duration could damage the component.

B: Where a remote ballast has to be installed or the luminaire is converted for emergency use with a remoteinverter the length of the associated wiring is severely restricted and the component manufacturers advicemust be sought if not already documented.

C: Cold start electronic ballasts, i.e. where the pre-heat time is very short, must not be used in conjunction withautomatic occupancy detectors. Warm start ballasts may be used as long as the on period is in excess of 20minutes otherwise very short lamp life will occur.

D: If Master/Slave configurations have to be used the maximum lead length must be ascertained from theballast manufacturer and compliance with the EMC Directive must be confirmed.

E: Within the luminaire ensure that the leads from the ballast to the lampholders are as short as possible andthose carrying the highest voltages known as hot wires should be the shortest. If in doubt ask your ballastsupplier.

F: You should ensure that each luminaire is supplied with detailed installation instructions to fully inform theinstaller of his liabilities.

This document is issued by LIF, and supported by ECA, ECA of Scotland and CIBSE.

CIBSE is a registered charity number 278104.

FACTFILE No 5 August 1997Advice regarding High Frequency electronic luminaires